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use INFORMATION_SCHEMA;
show tables;
Tables_in_information_schema
ALL_PLUGINS
APPLICABLE_ROLES
CHARACTER_SETS
CHECK_CONSTRAINTS
CLIENT_STATISTICS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
COLUMN_PRIVILEGES
ENABLED_ROLES
ENGINES
EVENTS
FILES
GEOMETRY_COLUMNS
GLOBAL_STATUS
GLOBAL_VARIABLES
INDEX_STATISTICS
INNODB_BUFFER_PAGE
INNODB_BUFFER_PAGE_LRU
INNODB_BUFFER_POOL_STATS
INNODB_CMP
INNODB_CMPMEM
INNODB_CMPMEM_RESET
INNODB_CMP_PER_INDEX
INNODB_CMP_RESET
INNODB_LOCKS
INNODB_LOCK_WAITS
INNODB_METRICS
INNODB_SYS_COLUMNS
INNODB_SYS_FIELDS
INNODB_SYS_FOREIGN
INNODB_SYS_FOREIGN_COLS
INNODB_SYS_INDEXES
INNODB_SYS_TABLES
INNODB_SYS_TABLESTATS
INNODB_SYS_VIRTUAL
INNODB_TABLESPACES_ENCRYPTION
INNODB_TRX
KEYWORDS
KEY_CACHES
KEY_COLUMN_USAGE
KEY_PERIOD_USAGE
OPTIMIZER_COSTS
OPTIMIZER_TRACE
PARAMETERS
PARTITIONS
PERIODS
PLUGINS
PROCESSLIST
PROFILING
REFERENTIAL_CONSTRAINTS
ROUTINES
SCHEMATA
SCHEMA_PRIVILEGES
SEQUENCES
SESSION_STATUS
SESSION_VARIABLES
SLAVE_STATUS
SPATIAL_REF_SYS
SQL_FUNCTIONS
STATISTICS
SYSTEM_VARIABLES
TABLES
TABLESPACES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TABLE_STATISTICS
TRIGGERS
USERS
USER_PRIVILEGES
USER_STATISTICS
VIEWS
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = t.table_schema AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
) order by t.table_name;
table_name column_name
ALL_PLUGINS PLUGIN_NAME
APPLICABLE_ROLES GRANTEE
CHARACTER_SETS CHARACTER_SET_NAME
CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
CLIENT_STATISTICS CLIENT
COLLATIONS COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
COLUMNS TABLE_SCHEMA
COLUMN_PRIVILEGES TABLE_SCHEMA
ENABLED_ROLES ROLE_NAME
ENGINES ENGINE
EVENTS EVENT_SCHEMA
FILES TABLE_SCHEMA
GEOMETRY_COLUMNS F_TABLE_SCHEMA
GLOBAL_STATUS VARIABLE_NAME
GLOBAL_VARIABLES VARIABLE_NAME
INDEX_STATISTICS TABLE_SCHEMA
INNODB_BUFFER_PAGE POOL_ID
INNODB_BUFFER_PAGE_LRU POOL_ID
INNODB_BUFFER_POOL_STATS POOL_ID
INNODB_CMP page_size
INNODB_CMPMEM page_size
INNODB_CMPMEM_RESET page_size
INNODB_CMP_PER_INDEX database_name
INNODB_CMP_RESET page_size
INNODB_LOCKS lock_id
INNODB_LOCK_WAITS requesting_trx_id
INNODB_METRICS NAME
INNODB_SYS_COLUMNS TABLE_ID
INNODB_SYS_FIELDS INDEX_ID
INNODB_SYS_FOREIGN ID
INNODB_SYS_FOREIGN_COLS ID
INNODB_SYS_INDEXES INDEX_ID
INNODB_SYS_TABLES TABLE_ID
INNODB_SYS_TABLESTATS TABLE_ID
INNODB_SYS_VIRTUAL TABLE_ID
INNODB_TABLESPACES_ENCRYPTION SPACE
INNODB_TRX trx_id
KEYWORDS WORD
KEY_CACHES KEY_CACHE_NAME
KEY_COLUMN_USAGE CONSTRAINT_SCHEMA
KEY_PERIOD_USAGE CONSTRAINT_SCHEMA
OPTIMIZER_COSTS ENGINE
OPTIMIZER_TRACE QUERY
PARAMETERS SPECIFIC_SCHEMA
PARTITIONS TABLE_SCHEMA
PERIODS TABLE_SCHEMA
PLUGINS PLUGIN_NAME
PROCESSLIST ID
PROFILING QUERY_ID
REFERENTIAL_CONSTRAINTS CONSTRAINT_SCHEMA
ROUTINES ROUTINE_SCHEMA
SCHEMATA SCHEMA_NAME
SCHEMA_PRIVILEGES TABLE_SCHEMA
SEQUENCES SEQUENCE_SCHEMA
SESSION_STATUS VARIABLE_NAME
SESSION_VARIABLES VARIABLE_NAME
SLAVE_STATUS Connection_name
SPATIAL_REF_SYS SRID
SQL_FUNCTIONS FUNCTION
STATISTICS TABLE_SCHEMA
SYSTEM_VARIABLES VARIABLE_NAME
TABLES TABLE_SCHEMA
TABLESPACES TABLESPACE_NAME
TABLE_CONSTRAINTS CONSTRAINT_SCHEMA
TABLE_PRIVILEGES TABLE_SCHEMA
TABLE_STATISTICS TABLE_SCHEMA
TRIGGERS TRIGGER_SCHEMA
USERS USER
USER_PRIVILEGES GRANTEE
USER_STATISTICS USER
VIEWS TABLE_SCHEMA
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = 'information_schema' AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
) order by t.table_name;
table_name column_name
ALL_PLUGINS PLUGIN_NAME
APPLICABLE_ROLES GRANTEE
CHARACTER_SETS CHARACTER_SET_NAME
CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
CLIENT_STATISTICS CLIENT
COLLATIONS COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
COLUMNS TABLE_SCHEMA
COLUMN_PRIVILEGES TABLE_SCHEMA
ENABLED_ROLES ROLE_NAME
ENGINES ENGINE
EVENTS EVENT_SCHEMA
FILES TABLE_SCHEMA
GEOMETRY_COLUMNS F_TABLE_SCHEMA
GLOBAL_STATUS VARIABLE_NAME
GLOBAL_VARIABLES VARIABLE_NAME
INDEX_STATISTICS TABLE_SCHEMA
INNODB_BUFFER_PAGE POOL_ID
INNODB_BUFFER_PAGE_LRU POOL_ID
INNODB_BUFFER_POOL_STATS POOL_ID
INNODB_CMP page_size
INNODB_CMPMEM page_size
INNODB_CMPMEM_RESET page_size
INNODB_CMP_PER_INDEX database_name
INNODB_CMP_RESET page_size
INNODB_LOCKS lock_id
INNODB_LOCK_WAITS requesting_trx_id
INNODB_METRICS NAME
INNODB_SYS_COLUMNS TABLE_ID
INNODB_SYS_FIELDS INDEX_ID
INNODB_SYS_FOREIGN ID
INNODB_SYS_FOREIGN_COLS ID
INNODB_SYS_INDEXES INDEX_ID
INNODB_SYS_TABLES TABLE_ID
INNODB_SYS_TABLESTATS TABLE_ID
INNODB_SYS_VIRTUAL TABLE_ID
INNODB_TABLESPACES_ENCRYPTION SPACE
INNODB_TRX trx_id
KEYWORDS WORD
KEY_CACHES KEY_CACHE_NAME
KEY_COLUMN_USAGE CONSTRAINT_SCHEMA
KEY_PERIOD_USAGE CONSTRAINT_SCHEMA
OPTIMIZER_COSTS ENGINE
OPTIMIZER_TRACE QUERY
PARAMETERS SPECIFIC_SCHEMA
PARTITIONS TABLE_SCHEMA
PERIODS TABLE_SCHEMA
PLUGINS PLUGIN_NAME
PROCESSLIST ID
PROFILING QUERY_ID
REFERENTIAL_CONSTRAINTS CONSTRAINT_SCHEMA
ROUTINES ROUTINE_SCHEMA
SCHEMATA SCHEMA_NAME
SCHEMA_PRIVILEGES TABLE_SCHEMA
SEQUENCES SEQUENCE_SCHEMA
SESSION_STATUS VARIABLE_NAME
SESSION_VARIABLES VARIABLE_NAME
SLAVE_STATUS Connection_name
SPATIAL_REF_SYS SRID
SQL_FUNCTIONS FUNCTION
STATISTICS TABLE_SCHEMA
SYSTEM_VARIABLES VARIABLE_NAME
TABLES TABLE_SCHEMA
TABLESPACES TABLESPACE_NAME
TABLE_CONSTRAINTS CONSTRAINT_SCHEMA
TABLE_PRIVILEGES TABLE_SCHEMA
TABLE_STATISTICS TABLE_SCHEMA
TRIGGERS TRIGGER_SCHEMA
USERS USER
USER_PRIVILEGES GRANTEE
USER_STATISTICS USER
VIEWS TABLE_SCHEMA
select 1 as "must be 1" from information_schema.tables where "ACCOUNTS"=
(select cast(table_name as char) from information_schema.tables
order by table_name limit 1) limit 1;
must be 1
1
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from information_schema.tables t
inner join information_schema.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'information_schema' and
c1.ordinal_position =
(select isnull(c2.column_type) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from information_schema.columns c2 where
c2.table_schema='information_schema' and
(c2.column_type = 'varchar(7)' or c2.column_type = 'varchar(20)')
group by c2.column_type order by num limit 1)
group by t.table_name order by num1, t.table_name;
table_name group_concat(t.table_schema, '.', t.table_name) num1
ALL_PLUGINS information_schema.ALL_PLUGINS 1
APPLICABLE_ROLES information_schema.APPLICABLE_ROLES 1
CHARACTER_SETS information_schema.CHARACTER_SETS 1
CHECK_CONSTRAINTS information_schema.CHECK_CONSTRAINTS 1
CLIENT_STATISTICS information_schema.CLIENT_STATISTICS 1
COLLATIONS information_schema.COLLATIONS 1
COLLATION_CHARACTER_SET_APPLICABILITY information_schema.COLLATION_CHARACTER_SET_APPLICABILITY 1
COLUMNS information_schema.COLUMNS 1
COLUMN_PRIVILEGES information_schema.COLUMN_PRIVILEGES 1
ENGINES information_schema.ENGINES 1
EVENTS information_schema.EVENTS 1
FILES information_schema.FILES 1
GEOMETRY_COLUMNS information_schema.GEOMETRY_COLUMNS 1
INDEX_STATISTICS information_schema.INDEX_STATISTICS 1
INNODB_BUFFER_PAGE information_schema.INNODB_BUFFER_PAGE 1
INNODB_BUFFER_PAGE_LRU information_schema.INNODB_BUFFER_PAGE_LRU 1
INNODB_BUFFER_POOL_STATS information_schema.INNODB_BUFFER_POOL_STATS 1
INNODB_CMP information_schema.INNODB_CMP 1
INNODB_CMPMEM information_schema.INNODB_CMPMEM 1
INNODB_CMPMEM_RESET information_schema.INNODB_CMPMEM_RESET 1
INNODB_CMP_PER_INDEX information_schema.INNODB_CMP_PER_INDEX 1
INNODB_CMP_RESET information_schema.INNODB_CMP_RESET 1
INNODB_LOCKS information_schema.INNODB_LOCKS 1
INNODB_LOCK_WAITS information_schema.INNODB_LOCK_WAITS 1
INNODB_METRICS information_schema.INNODB_METRICS 1
INNODB_SYS_COLUMNS information_schema.INNODB_SYS_COLUMNS 1
INNODB_SYS_FIELDS information_schema.INNODB_SYS_FIELDS 1
INNODB_SYS_FOREIGN information_schema.INNODB_SYS_FOREIGN 1
INNODB_SYS_FOREIGN_COLS information_schema.INNODB_SYS_FOREIGN_COLS 1
INNODB_SYS_INDEXES information_schema.INNODB_SYS_INDEXES 1
INNODB_SYS_TABLES information_schema.INNODB_SYS_TABLES 1
INNODB_SYS_TABLESTATS information_schema.INNODB_SYS_TABLESTATS 1
INNODB_SYS_VIRTUAL information_schema.INNODB_SYS_VIRTUAL 1
INNODB_TABLESPACES_ENCRYPTION information_schema.INNODB_TABLESPACES_ENCRYPTION 1
INNODB_TRX information_schema.INNODB_TRX 1
KEY_CACHES information_schema.KEY_CACHES 1
KEY_COLUMN_USAGE information_schema.KEY_COLUMN_USAGE 1
KEY_PERIOD_USAGE information_schema.KEY_PERIOD_USAGE 1
OPTIMIZER_COSTS information_schema.OPTIMIZER_COSTS 1
OPTIMIZER_TRACE information_schema.OPTIMIZER_TRACE 1
PARAMETERS information_schema.PARAMETERS 1
PARTITIONS information_schema.PARTITIONS 1
PERIODS information_schema.PERIODS 1
PLUGINS information_schema.PLUGINS 1
PROCESSLIST information_schema.PROCESSLIST 1
PROFILING information_schema.PROFILING 1
REFERENTIAL_CONSTRAINTS information_schema.REFERENTIAL_CONSTRAINTS 1
ROUTINES information_schema.ROUTINES 1
SCHEMATA information_schema.SCHEMATA 1
SCHEMA_PRIVILEGES information_schema.SCHEMA_PRIVILEGES 1
SEQUENCES information_schema.SEQUENCES 1
SLAVE_STATUS information_schema.SLAVE_STATUS 1
SPATIAL_REF_SYS information_schema.SPATIAL_REF_SYS 1
STATISTICS information_schema.STATISTICS 1
SYSTEM_VARIABLES information_schema.SYSTEM_VARIABLES 1
TABLES information_schema.TABLES 1
TABLESPACES information_schema.TABLESPACES 1
TABLE_CONSTRAINTS information_schema.TABLE_CONSTRAINTS 1
TABLE_PRIVILEGES information_schema.TABLE_PRIVILEGES 1
TABLE_STATISTICS information_schema.TABLE_STATISTICS 1
TRIGGERS information_schema.TRIGGERS 1
USERS information_schema.USERS 1
USER_PRIVILEGES information_schema.USER_PRIVILEGES 1
USER_STATISTICS information_schema.USER_STATISTICS 1
VIEWS information_schema.VIEWS 1
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: information_schema
| Tables |
| ALL_PLUGINS |
| APPLICABLE_ROLES |
| CHARACTER_SETS |
| CHECK_CONSTRAINTS |
| CLIENT_STATISTICS |
| COLLATIONS |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS |
| COLUMN_PRIVILEGES |
| ENABLED_ROLES |
| ENGINES |
| EVENTS |
| FILES |
| GEOMETRY_COLUMNS |
| GLOBAL_STATUS |
| GLOBAL_VARIABLES |
| INDEX_STATISTICS |
| INNODB_BUFFER_PAGE |
| INNODB_BUFFER_PAGE_LRU |
| INNODB_BUFFER_POOL_STATS |
| INNODB_CMP |
| INNODB_CMPMEM |
| INNODB_CMPMEM_RESET |
| INNODB_CMP_PER_INDEX |
| INNODB_CMP_RESET |
| INNODB_LOCKS |
| INNODB_LOCK_WAITS |
| INNODB_METRICS |
| INNODB_SYS_COLUMNS |
| INNODB_SYS_FIELDS |
| INNODB_SYS_FOREIGN |
| INNODB_SYS_FOREIGN_COLS |
| INNODB_SYS_INDEXES |
| INNODB_SYS_TABLES |
| INNODB_SYS_TABLESTATS |
| INNODB_SYS_VIRTUAL |
| INNODB_TABLESPACES_ENCRYPTION |
| INNODB_TRX |
| KEYWORDS |
| KEY_CACHES |
| KEY_COLUMN_USAGE |
| KEY_PERIOD_USAGE |
| OPTIMIZER_COSTS |
| OPTIMIZER_TRACE |
| PARAMETERS |
| PARTITIONS |
| PERIODS |
| PLUGINS |
| PROCESSLIST |
| PROFILING |
| REFERENTIAL_CONSTRAINTS |
| ROUTINES |
| SCHEMATA |
| SCHEMA_PRIVILEGES |
| SEQUENCES |
| SESSION_STATUS |
| SESSION_VARIABLES |
| SLAVE_STATUS |
| SPATIAL_REF_SYS |
| SQL_FUNCTIONS |
| STATISTICS |
| SYSTEM_VARIABLES |
| TABLES |
| TABLESPACES |
| TABLE_CONSTRAINTS |
| TABLE_PRIVILEGES |
| TABLE_STATISTICS |
| TRIGGERS |
| USERS |
| USER_PRIVILEGES |
| USER_STATISTICS |
| VIEWS |
+---------------------------------------+
+---------------------------------------+
+---------------------------------------+
Database: INFORMATION_SCHEMA
| Tables |
| ALL_PLUGINS |
| APPLICABLE_ROLES |
| CHARACTER_SETS |
| CHECK_CONSTRAINTS |
| CLIENT_STATISTICS |
| COLLATIONS |
| COLLATION_CHARACTER_SET_APPLICABILITY |
| COLUMNS |
| COLUMN_PRIVILEGES |
| ENABLED_ROLES |
| ENGINES |
| EVENTS |
| FILES |
| GEOMETRY_COLUMNS |
| GLOBAL_STATUS |
| GLOBAL_VARIABLES |
| INDEX_STATISTICS |
| INNODB_BUFFER_PAGE |
| INNODB_BUFFER_PAGE_LRU |
| INNODB_BUFFER_POOL_STATS |
| INNODB_CMP |
| INNODB_CMPMEM |
| INNODB_CMPMEM_RESET |
| INNODB_CMP_PER_INDEX |
| INNODB_CMP_RESET |
| INNODB_LOCKS |
| INNODB_LOCK_WAITS |
| INNODB_METRICS |
| INNODB_SYS_COLUMNS |
| INNODB_SYS_FIELDS |
| INNODB_SYS_FOREIGN |
| INNODB_SYS_FOREIGN_COLS |
| INNODB_SYS_INDEXES |
| INNODB_SYS_TABLES |
| INNODB_SYS_TABLESTATS |
| INNODB_SYS_VIRTUAL |
| INNODB_TABLESPACES_ENCRYPTION |
| INNODB_TRX |
| KEYWORDS |
| KEY_CACHES |
| KEY_COLUMN_USAGE |
| KEY_PERIOD_USAGE |
| OPTIMIZER_COSTS |
| OPTIMIZER_TRACE |
| PARAMETERS |
| PARTITIONS |
| PERIODS |
| PLUGINS |
| PROCESSLIST |
| PROFILING |
| REFERENTIAL_CONSTRAINTS |
| ROUTINES |
| SCHEMATA |
| SCHEMA_PRIVILEGES |
| SEQUENCES |
| SESSION_STATUS |
| SESSION_VARIABLES |
| SLAVE_STATUS |
| SPATIAL_REF_SYS |
| SQL_FUNCTIONS |
| STATISTICS |
| SYSTEM_VARIABLES |
| TABLES |
| TABLESPACES |
| TABLE_CONSTRAINTS |
| TABLE_PRIVILEGES |
| TABLE_STATISTICS |
| TRIGGERS |
| USERS |
| USER_PRIVILEGES |
| USER_STATISTICS |
| VIEWS |
+--------------------+
+--------------------+
+--------------------+
Wildcard: inf_rmation_schema
| Databases |
| information_schema |
SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') GROUP BY TABLE_SCHEMA;
table_schema count(*)
information_schema 72
mysql 31
|
